Ambinder previews it:

The Democratic strategy in a nutshell is small enough to fit in one but has the protein of a good, tasty nut. The Republicans want to be mayors of crazy-town. They've embraced a fringe and proto-racist isolationist and ignorant conservative populism that has no solutions for fixing anything and the collective intelligence of a wine flask. This IS offensive and over the top, and the more Democrats repeat it, and the more dumb things some Republican candidates do, the more generally conservative voters who might be thinking of sending a message to Democrats by voting for a Republican will be reminded that the replacement party is even more loony than the party that can't tie its shoes. This is a strategy of delegitimization, not affirmation.

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